The merger will be an all-stock transaction, and will now be subject to regulatory approval. That latter part is going to be its biggest challenge, because it will not only tie up the No. 3 and No. 4 carriers into the U.S. into a single unit, but also that international organizations hold significant stakes in both companies. SoftBank controls a majority of Sprint while Deutsche Telekom controls a significant chunk of T-Mobile. Following the administration’s intervention in the Broadcom-Qualcomm takeover attempt, it isn’t clear what will actually go through in terms of major mergers these days.

Bloomberg is reporting that Deutsche Telekom will have 42% ownership of the combined company, while SoftBank will own around 27% of the company.

As expected, the argument here is for the expansion of 5G networks as plans for that start to ramp up. T-Mobile argues in its announcement that it will help it be competitive with AT&T and Verizon as telecom companies start to roll out a next-generation 5G network, though it does in the end remove a carrier choice for end consumers in the U.S..

“The New T-Mobile will have the network capacity to rapidly create a nationwide 5G network with the breadth and depth needed to enable U.S. firms and entrepreneurs to continue to lead the world in the coming 5G era, as U.S. companies did in 4G,” T-Mobile said in a statement as part of the announcement. “The new company will be able to light up a broad and deep 5G network faster than either company could separately. T-Mobile deployed nationwide LTE twice as fast as Verizon and three times faster than AT&T, and the combined company is positioned to do the same in 5G with deep spectrum assets and network capacity.”

Both companies appeared to be finalizing the deal on Friday, when they set valuation terms and were preparing to announce the merger today. The deal values Sprint at an enterprise value of around $59 billion, with the combined company having an enterprise value of $146 billion. AT&T has a market cap of around $214 billion, while Verizon has a market cap of around $213 billion, as of Sunday.

I’m excited to announce that @TMobile & @Sprinthave reached an agreement to come together to form a new company – a larger, stronger competitor that will be a force for positive change for all US consumers and businesses! Watch this & click through for details.